Model comparison
GPT-6 Astra vs Granite 4.2 3b
GPT-6 Astra is the stronger model overall, scoring 70.3 to 39.0 on the Noometry Index.
Last verified . 11 shared benchmarks.
Summary
- They share 11 benchmarks with published results for both. GPT-6 Astra scores higher in 7 categories and Granite 4.2 3b in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 25.0.
- Granite 4.2 3b has downloadable open weights; the other is API-only.
Side by side
| GPT-6 Astra | Granite 4.2 3b | |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 70.3 | 39.0 |
| Released | 2026-09-03 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $10 | — |
| Output $ / M tokens | $50 | — |
| Results tracked | 51 | 11 |
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Category by category
Coding GPT-6 Astra leads
GPT-6 Astra: 70.5 (#3), Granite 4.2 3b: 39.4 (#146)
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| LMArena Coding | 1488 | 1363 |
| DeepSWE | 74.1% | — |
| FrontierCode | 53.3% | — |
| LMArena WebDev | 1792 | — |
| FrontierSWE | 65.5% | — |
| SciCode | 56.5% | — |
| WeirdML | 93.6% | — |
| MirrorCode | 46.7% | — |
| ALE-Bench | 2,951 | — |
Agentic & Tool Use Not comparable
GPT-6 Astra: 52.3 (#3), Granite 4.2 3b: —
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| APEX-Agents | 64.7% | — |
| Remote Labor Index | 20.8% | — |
| BALROG | 68.3% | — |
| Vending-Bench 2 | 15,515 | — |
Reasoning GPT-6 Astra leads
GPT-6 Astra: 85.1 (#1), Granite 4.2 3b: 25.0 (#136)
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| LMArena Hard Prompts | 1464 | 1308 |
| ARC-AGI-2 | 95% | — |
| NYT Connections (extended) | 98.1% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 31.7% | — |
| Chess Puzzles | 72% | — |
| EBR-Bench | 76.2% | — |
| Mystery Game Puzzles | 84% | — |
| DTBench | 97.3% | — |
| LMCA | 64.4% | — |
| Bench to the Future 3 | 0.14 | — |
| Epoch Capabilities Index | 166.6 | — |
Math Not comparable
GPT-6 Astra: 93.4 (#1), Granite 4.2 3b: —
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| FrontierMath (Tiers 1-3) | 93.7% | — |
| FrontierMath Tier 4 | 97.6% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 99% | — |
| LMArena Math | 1463 | — |
| FrontierMath Erdős | 2.9% | — |
Knowledge GPT-6 Astra leads
GPT-6 Astra: 75.3 (#1), Granite 4.2 3b: 35.6 (#169)
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| LMArena Expert | 1486 | 1313 |
| GPQA Diamond | 95.8% | — |
| Humanity's Last Exam | 54.8% | — |
| SimpleQA Verified | 75.6% | — |
| Vectara Hallucination Rate | 8.7% | — |
Multimodal Not comparable
GPT-6 Astra: 55.1 (#3), Granite 4.2 3b: —
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| LMArena Vision | 1280 | — |
| Blueprint-Bench 2 | 49.7% | — |
| Furniture Assembly | 80% | — |
| LMArena Document | 1468 | — |
Multilingual GPT-6 Astra leads
GPT-6 Astra: 54.0 (#53), Granite 4.2 3b: 42.4 (#193)
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| LMArena Non-English | 1431 | 1268 |
| LMArena Chinese | 1495 | 1268 |
| LMArena Russian | 1434 | 1249 |
| LMArena French | 1467 | — |
| LMArena Spanish | 1412 | — |
Instruction Following GPT-6 Astra leads
GPT-6 Astra: 76.6 (#37), Granite 4.2 3b: 67.2 (#195)
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| LMArena Instruction Following | 1454 | 1271 |
Long Context GPT-6 Astra leads
GPT-6 Astra: 44.7 (#57), Granite 4.2 3b: 39.3 (#179)
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| LMArena Longer Query | 1460 | 1293 |
Writing & Preference GPT-6 Astra leads
GPT-6 Astra: 75.7 (#7), Granite 4.2 3b: 47.9 (#202)
| Benchmark | GPT-6 Astra | Granite 4.2 3b |
|---|---|---|
| LMArena Text | 1443 | 1295 |
| LMArena Creative Writing | 1423 | 1215 |
| LMArena Multi-Turn | 1457 | 1293 |
| EQ-Bench Creative Writing | 2173 | — |
Frequently asked questions
Is GPT-6 Astra better than Granite 4.2 3b?
GPT-6 Astra is the stronger model overall, scoring 70.3 to 39.0 on the Noometry Index.
Is GPT-6 Astra or Granite 4.2 3b better for coding?
GPT-6 Astra scores higher on coding benchmarks: 70.5 versus 39.4 in the Noometry coding category.
How many benchmarks do GPT-6 Astra and Granite 4.2 3b share?
11 benchmarks have published results for both models. GPT-6 Astra has 51 scored results on Noometry and Granite 4.2 3b has 11.